<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #app{
      width: 400px;
      height: 400px;
      background: red;
    }
  </style>
</head>

<body>
  <div id="app"></div>>

  <script>
    const oApp = document.querySelector('#app')
    function center(e) {
      console.log('我是核心函数');
      console.log(this);
      console.log(e);
    }
    function throttle(fn, time) {
      let lastTime = 0
      return function (e) {
        let nowTime = Date.now()
        if (nowTime - lastTime < time) return
        lastTime = nowTime
        fn.call(this, e)
      }
    }
    oApp.onmousemove = throttle(center, 1000)
  </script>
</body>

</html>